Piotr Maślanka <piotr.masla...@henrietta.com.pl> added the comment:

I runned it over again with code:

print 'Acquiring lock'
self.loglock.acquire()
print 'Attempting to convert'
if type(text) == unicode: text = text.encode('utf8', errors='strict')
print 'Opening '+threadspecific
with open(threadspecific, 'ab') as x: x.write(text+'\r\n')
print 'Closing '+threadspecific
self.loglock.release()
print 'Releasing lock'

It behaves erratically, sometimes working and yielding:
Acquiring lock
Acquiring lock
Attempting to convert
Opening threadspecific_master
Closing threadspecific_master
Releasing lock
Attempting to convert
Opening threadspecific_slave
Closing threadspecific_slave
Releasing lock

And sometimes hanging with:

Acquiring lock
Attempting to convert
Acquiring lock

Looks like a particularly nasty race condition. It gives off no exceptions. 
Platform is Windows 7 x64, running with admin privileges.

----------
type:  -> crash

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<http://bugs.python.org/issue10923>
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